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Gearbox gurus please read this!

To: triumphs@autox.team.net
Subject: Gearbox gurus please read this!
From: Nicholas Froome <listreader@pvision.co.uk>
Date: Sun, 16 Mar 2003 22:53:02 +0000
References: <001801c2ec04$bc45a3a0$3269930a@rick>
Calling all gearbox gurus... I have a UK supplier for a TR4 close-ratio gearbox 
gearset. They're helical-cut gears, work with ordinary synchros, etc, and 
they're not expensive

I think that means the "close-ratio gearset" is made up of easily available 
bits from other boxes

So, any ideas what? The ideal would be a slightly lower third and fourth, I 
think, if I keep the OD

On the subject of overdrives, has anyone tried changing the OD ratio? 3rd over 
is just 4% different to 4th, if I remember the ratios correctly. If we make the 
gap between 2nd & 3rd (and 3rd & 4th) closer, then the overdrive won't sit 
between the gears - 3rd over will likely be taller than 4th!

Ideally we'd use the OD to split the gaps exactly between gears - so we'd need 
a lower step-up in the OD 


All ideas gratefully received!


Nick Froome
http://www.bolide.co.uk

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